Four Types of Cells
Goblet
Parietel
Chief
Mucous Mucous cells: secrete an alkaline mucus that protects the epithelium against shear stress and acid
Parietal cells: secrete hydrochloric acid!
Chief cells: secrete pepsin, a proteolytic enzyme
G cells: secrete the hormone gastrin Gastric function is often classified into three phases
Phase 1 Cephalic phase ("wake up call"):Seeing, smelling and anticipating food inperceived in the brain and the brain informs the stomach that it shouldprepare for receipt of a meal.
Phase 2 Gastric phase ("full steam ahead"): When a meal enters the stomach several additional factors come into play, foremost among them distension and mucosal irritation.
Phase 3 Intestinal phase ("step on the brakes"): As food is liquefied in the stomach, it is emptied into the small intestine. It seems to be important for the small intestine to be able to slow down gastric emptying, probably to allow it time to neutralize the acid and efficiently absorb incoming nutrients. How many meals should you eat a Day?
The stomach functions dynamically, in parallel with meals. Consider the stomach's most notable activity - secretion of acid. Acid is secreted in large quantities when the stomach is distended with food, which is useful because it facilitates the initial breakdown of proteins. However, once the meal has been liquefied and the stomach has emptied, acid secretion trickles to a stop and remains shut off during the inter-digestive period. This shut-off in acid secretion is a good thing - otherwise excessive acid would damage the mucosa of the stomach and small intestine, as happens in certain disease states.
Goblet
Parietel
Chief
Mucous
Mucous cells: secrete an alkaline mucus that protects the epithelium against shear stress and acid
Parietal cells: secrete hydrochloric acid!
Chief cells: secrete pepsin, a proteolytic enzyme
G cells: secrete the hormone gastrin
Gastric function is often classified into three phases
Phase 1
Cephalic phase ("wake up call"): Seeing, smelling and anticipating food in perceived in the brain and the brain informs the stomach that it should prepare for receipt of a meal.
Phase 2
Gastric phase ("full steam ahead"): When a meal enters the stomach several additional factors come into play, foremost among them distension and mucosal irritation.
Phase 3
Intestinal phase ("step on the brakes"): As food is liquefied in the stomach, it is emptied into the small intestine. It seems to be important for the small intestine to be able to slow down gastric emptying, probably to allow it time to neutralize the acid and efficiently absorb incoming nutrients.
How many meals should you eat a Day?
The stomach functions dynamically, in parallel with meals. Consider the stomach's most notable activity - secretion of acid. Acid is secreted in large quantities when the stomach is distended with food, which is useful because it facilitates the initial breakdown of proteins. However, once the meal has been liquefied and the stomach has emptied, acid secretion trickles to a stop and remains shut off during the inter-digestive period. This shut-off in acid secretion is a good thing - otherwise excessive acid would damage the mucosa of the stomach and small intestine, as happens in certain disease states.